Name: ビィビィ (Biybiy, BB)

Other Names: Mysterious Black Magus, Black Blossom, Bottom Black

Role: GameMaster, Master, Servant

Height: 156cm/5.1ft

Weight: 46kg/101lbs

Three Sizes: B85/W56/H87

Blood Type: O

Birthday: March 2

Ship: N/A

Bishop Staff of Rulership: is the teacher's pointer that BB carries. A device that allows her to use her authority as an advanced level AI to its fullest. There are restrictions from the far side of the moon, but with this, BB can revise the game rules (spirit particle laws within the SE.RA.PH). It is the Domina Coronam: Crowns of Ten Rulerships worn by the Beast of Babylon converted into a teacher's cane.

Aurea Poculum: A golden grail that BB pulls out of her bosom, it's indicated that the damage ranges from corruption to total annihilation, as example the fight against Gawain in CCC.

Nyarlathotep: The Outer God that BB has formed a contract with in her original universe. It is known that Nyarlathotep appears whenever he wishes, and his powers are equally shared with the AI.

Cursed Cutting Crater (EX): is an attack on the World utilizing BB's control of the Moon Cell. It's also a trap for artificial spiritron hackers. Also called the Spirit Particle Imaginary Pit. Making maximum use of the EX Rank Skill "Potnia Theron", a world purge via the rewriting of events is carried out. The space eroded by BB becomes imaginary space and a curse that consumes reality which eclipses the world. CCC, as the name suggests, is a cursed pit that bores out reality. The name “Cursed” is based on the image of a giant spoon that scoops out the surface of the Moon and turns it into a cursed space (the imaginary space). Its output of information is like an ultra-precise 3D printer and crushes the present world with the world desired by the user. In addition to scattering all objects inside on an atomic level and reconstructing them, it is capable of writing over and rewriting information of fields such as luck and coincidence. While theoretical, it is also thought possible to distort the time axis by interfering with gravity fields and rewrite the law of cause and effect. When used in combat, BB’s familiars, the shapeshifters, engulf the target, and after turning into a sphere, is wiped out of existence along with the target and the dimension with it.

Skill Construction (A)

Territory Creation (A)

Magic Resistence (B)

Domina Cornam (EX): Ten Crowns is an EX rank skill. It has been said that the ten crowns indicates the ten evil kings and the seven hills indicate the abominable city of evil. It is unknown what kind of principle・authority it is, but that power's origin lies in a past that even the King of Heroes, who was supposed to be mankind's oldest, cannot reach. On a simple look, it is a Skill that turns received injuries and occurred events, that make all results as if "nothing happened". As a matter of fact, BB is invincible as long as she has this skill. As of Fate/Grand Order she chooses not to use the full potential of this skill, claiming that invincibility cheats are boring.

Self-Modification (EX): is the EX rank skill to remodel oneself. The AIs manufactured by the Moon Cell are furnished with an absolute order of "do not improve its functions". But BB, who escaped from this restriction due to a break-down, began to expand her own functions. In order to enhance her calculation abilities, she predated・decomposed through the black noises NPCs, AIs and even Servants on top of that and employed them as her own memory. A posterior add-on that is not weary of self-breakdown, but, as a result, BB changed into a hyper grade AI that possesses an enormous capacity. These circumstances are like a city of reclaimed land that continues to construct buildings even as it sinks into water, or even the monster of Frankenstein. However, she discovered later on that she could only handle so many modifications before they ran the risk of causing her to shut down from overloading her own programming; BB describes this experience as being akin to putting a nuclear reactor on a manual scooter, with the end result being the engineering equivalent of a malignant tumor's spread. The Sakura Five were created by BB as a workaround to avoid having her thought processes and body fall apart from the strain of over-modification.

Name: ワトソン・アメリア (Amelia Watson)

Nicknames: Ame, Ame-chan

Affiliation: HoloMyth EN

Age: 18 (?)

Height: 150 cm/4.11ft

Zodiac Sign: Capricorn

Birthday: January 6

Ability: Time Travel

Mascot: Bubba

Catchphrase: "hic!"

Ship: Ina'nis/Gawr Gura

Name: 虞美人 (Yu Mei-ren)

Nicknames: Gucchan

Role: Elemental, Vampire, Magus, Master

Age: 2000

Height: 160cm/5.2ft

Weight: 49kg/108lbs

Birthday: Unknown

Likes: Reading, trekking (off-season only)

Dislikes: Noisy atmosphere, crowds, prying of others

Ship: N/A

Name: 星街すいせい (Hoshimati Suisei)

Nicknames: Sui-chan, Suityan, Suicopath, Comet

Affiliation: Hololive JP Gen 0

Age: 18 (forever)

Height: 160cm/5.3ft

Zodiac Sign: Aries

Birthday: March 22

Ability: Being a fuckin' psychopath without remorse

Catchphrase: "Sui-chan waaaa... kyou mo kawaii~!"

Ship: Tokoyami Towa

Name: タマモヴィッチ (Tamamo Vitch)

Other Names: Koyanskaya, Daji

Role: Servant, Evil of Man, Demon

Age: ???

Class: BEAST (Treasured Beast), Alter Ego

Abilities: Traveling easily through all Lostbelts, Amaterasu's full potential (SLs), Presence Concealment (?), Independent Manifestation (?), Nega-Weapon, Eternal Darkness Gradiation, Fear Me Respect Me, Cursed Swelling, Dim Radiance

Noble Phantasm: Star of Calamity

Ship: BB